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I am gathering parts for the dual exhaust I'm putting on the convt, planning on 2-1/4" pipe w/50 series flowmaster mufflers, I'm only guessing that I need the offset inlet and center outlet. I'm exiting through
the valence. Is this correct?



64.5 convertible (restomod in progress)
sold the COBRA for family sedan (new addition)


I dont need my wifes permission....
I'm not above begging forgiveness!!
 

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Rich,

flowmaster now makes an AMERICAN THUNDER dual exhaust system for 64.5 - 66 Mustangs. I believe it is about $265.00 and includes EVERYTHING. When my system falls off the car, I will prbably look at that system.



Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat

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I hope you like your car LOUD! I'm running three chamber flow masters and can hardly have a conversation while driving. I hear the 50 series are much louder. Don't make the same mistake I did. Make sure you've picked the muffler that works best for you. Good Luck.
 

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I'd buy the "Flowmasters" sold by Dynomax called "Super-Turbos"!.

Speaking seriously, I'd only buy Flowmasters mandrel bent tail pipes (Summitt Racing), cut the tips off and weld on turndowns near the rear valence in the stock location. Have your local exhaust shop run the intermediate pipes from your tri-Ys through an X junction and into your center inlet Dynomax mufflers. Hook up the offset outlet on the muffler to your new Flowmaster tailpipes. Use the stock hangers.

Do it all in 2 1/2". Just ask Midlife, he heard my car running with this setup last weekend. I distinctly remember the big smile on his face. (Not too loud)

You'll be very happy!

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That kit is nice... but it won't fit convertibles. I would suggest the Flowmaster tailpipes (as other post recomended) and a set of Borla or Dynomax (straight through... not chambered) Mufflers. Then have a shop do the connecting work with a nice H crossover ... forget the X it's not worth it.

BTW... you are correct on the offset inlet/center outlet

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1967 351W Convertible
2000 Mustang GT
 
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Discussion Starter #6
thanks for the responses so far. If I read their application chart correctly, the 50 series is 3-chamber. I
am looking into the american thunder system now. Also the intermediate pipes that roadracer mentioned.








64.5 convertible (restomod in progress)
sold the COBRA for family sedan (new addition)


I dont need my wifes permission....
I'm not above begging forgiveness!!
 

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I hear ya there....or should I say I can't hear ya. LOL. If you think that 3-chamber flowmasters are loud, you should try two chamber. With the 351W, high compression, it has a slight earthquake affect in the garage. It's a little quieter with the 302, but not much.

I bet my neighbors love me when I head to work at 5:30 am. *G*

Rob
Member: Slightly Modified
66 coupe 302
66 fastback 351W
 
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I thought the 3 chambered flows were supposed to be somewhat quiet? or at least quieter than the 2 chambered?

~Chris
San Antonio, Tx
66 coupe 289
70 fastback done by may/graduation...hopefully
 
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well, they are quieter than the 2 chamber 40-series. everybody has a different threshold for noise levels though. I like a "healthy" exhaust note.

Gotta drown out the "bass-pounding, booger-eating, Turn it up till
it makes my ears bleed, teen in the spoke-wheeled accord next to me!"

64.5 convertible (restomod in progress)
sold the COBRA for family sedan (new addition)


I dont need my wifes permission....
I'm not above begging forgiveness!!
 
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I have been looking to replace my setup from the stock 67 gt style setup (resonators and transversal muffler) to a 66 style with 2 flowmasters on either side and 2 1/2 all the way back. I would like louder and healthier than I have now, but not teeth rattling. What is the differences in the different mufflers described above, list if possible. And I have heard that going smaller after the muffler is advised...whats up with that??

67 mustang coupe
70 mustang mach 1
88 mazda/ford mx-6

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